美团数开3月25日笔试第五题：二维 dp

import java.util.*;

public class P5 {
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        int n = cin.nextInt(), k = cin.nextInt();
        int[] nums = new int[n + 1];
        for (int i = 1; i <= n; i++) {
            nums[i] = cin.nextInt();
        }

        int[][] dp = new int[n + 1][k + 1];
        for (int i = 1; i <= n; i++) {
            for (int j = 0; j <= k; j++) {
                if (i == 1) {
                    dp[i][j] = nums[i];
                } else if (j == 0) {
                    dp[i][j] = Math.max(dp[i - 1][j], nums[i] + dp[i - 2][j]);
                } else {
                    dp[i][j] = Math.max(dp[i - 1][j], nums[i] + Math.max(dp[i - 1][j - 1], dp[i - 2][j]));
                }
            }
        }
        System.out.println(dp[n][k]);
    }
}